Very long compile times for small changes

cjk

Hi there,

I am currently working on a Forum/community system in Elixir using Phoenix. First everything was nice, but slowly the compile times increased. It got so bad that now small changes can take up to 30 seconds.

I already read about compile dependencies and stuff, but I can’t really make sense of tools like mix xref. The generated graphic is unusable (image viewers seem not to be able to show the image) and the tree/stats views are confusing to me.

I already tried to fight this problem by stripping out imports and requires, and it made things better – but by far not good.

Can somebody point me to resources explaining how to use tools like mix xref or explain me what I am doing wrong?

My project is a FLOSS and hosted on Github: https://github.com/ckruse/cforum_ex/

Edit: also please don’t mince matters. If you think I am using anti patterns and thus causing this problem myself, tell me. I can handle that and love to learn.

Thanks in advance,
CK

19 comments

/phoenix #compiler

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2021-02-26 22:42:21 UTC

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hlx

Did you try deleting the _build folder? Whenever I have the slightest problem I always first delete _build, deps and .elixir_ls

Post #1

cjk

Yes, did that. Doesn’t change anything.

Post #2

kwando

I get this while trying to run build it:

➜  cforum_ex git:(master) mix deps.get
** (Code.LoadError) could not load /Users/kwando/projects/cforum_ex/config/appsignal.exs
    (elixir) lib/code.ex:1192: Code.find_file/2
    (elixir) lib/code.ex:758: Code.eval_file/2
    (mix) lib/mix/config.ex:158: anonymous fn/2 in Mix.Config.__import__!/2
    (elixir) lib/enum.ex:1948: Enum."-reduce/3-lists^foldl/2-0-"/3
    (mix) lib/mix/config.ex:157: Mix.Config.__import__!/2
    (stdlib) erl_eval.erl:680: :erl_eval.do_apply/6
    (elixir) lib/code.ex:240: Code.eval_string/3

Post #3

hlx

Just run touch config/appsignal.exs

Post #4

cjk

Ah, right - you have to create a appsignal.exs, this file contains secrets and thus is not in the repo. A simple use Mix.Config in this file should be enough.

Post #5

hlx

I’ve cloned your app and it seems to compile at the same speed as my own projects

https://asciinema.org/a/2N1DeYHwWBbrXbJxlM9hJRTca

Post #6

cjk

And now change e.g. lib/cforum_web/layout/app.html.eex and watch getting a whole bunch of files recompiled

Post #7

hlx

Elixir files or assets? I can’t seem to run the migrations and therefor not the app so I can’t really check.

Post #8

cjk

No, assets are in the webpack domain. Elixir files (.ex or .eex).

You can check w/o running the migrations by using mix compile without calling mix clean before.

Post #9

hlx

➜  cforum_ex git:(master) ✗ mix ecto.create
The database for Cforum.Repo has already been created
➜  cforum_ex git:(master) ✗ mix ecto.migrate

21:31:50.913 [info]  == Running 20181023062557 Cforum.Repo.Migrations.MakeTagsGlobal.change/0 forward

21:31:50.915 [info]  alter table tags
** (Postgrex.Error) ERROR 42P01 (undefined_table) relation "tags" does not exist

EDIT: didn’t read the previous message correctly, will check now with mix compile

Post #10

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